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AT&T Merlin five-button telephone (voice terminal) manufactured in early 1980. AT&T Merlin is a corporate telephone system by American Telephone and Telegraph (AT&T) that was introduced in late 1983, when it was branded American Bell Merlin. After the breakup of the Bell System in 1984, it was rebranded and later also supplied by Lucent and Avaya.
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PARTNER ACS (Advanced Communications System), Replaced by IP Office 500 Partner Mode/Edition; PARTNER Small Office Edition; S8700 & S8720; S8500; S8300 a, b & c; SPIRIT; System 25 (Previously made by AT&T) System 75 (Previously made by AT&T) System 75 XE (Previously made by AT&T) System 85 (Previously made by AT&T) IP Office 400 (SOE, 403, 406 ...
A business telephone system differs from an installation of several telephones with multiple central office (CO) lines in that the CO lines used are directly controllable in key telephone systems from multiple telephone stations, and that such a system often provides additional features for call handling.
Unique to the OPD was a telephony module incorporating an Intel 8051 microcontroller (which also controlled the keyboard), two PSTN lines and a V.21/V.23 modem, plus a built-in telephone handset and a Texas Instruments TMS5220 speech synthesiser (for automatic answering of incoming calls).
PSTN network topology is the switching network topology of a telephone network connected to the public switched telephone network (PSTN).. In the United States and Canada, the Bell System network topology was the switching system hierarchy implemented and operated from c. 1930 to the 1980s for the purpose of integrating the diverse array of local telephone companies and telephone numbering ...
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